BIOL100 Study Guide - Midterm Guide: Polyploid, Gene Flow, Gastrulation
Document Summary
The evolution of similar or analogous features in distantly related groups. Analogous traits arise when groups independently adapt to similar environments in different ways. Natural selection *observations: there is a difference in phenotypes for most characters in a population, there traits come from the parents, overproduction of offspring is frequently seen in nature, only lucky few offspring will mature and reproduce. Natural selection- cautions: survival of the fittest- evolution operates on populations, only heritable traits are passed on, may be suitable for one environment. Populations= a localized group of individuals that belong to the same species. Species= a group of organisms that possess similar characteristic and can interbreed. Microevolution is a change in allele frequencies in a population. Population genetics *sources of genetic variation & changes in allele frequency* Sources of genetic variation: mutation, point mutations, alterations of gene number or sequence, sexual reproduction, crossing over b, fertilization.
